National Instruments GPIB-PC - Manual (Page 235)

Common Errors and Their Solutions Appendix B
GPIB-PC User Manual B-6 ©National Instruments Corp.
EBUS(14)
Error Condition: Command error during device call.
Solutions:
• Find out which device is abnormally slow to accept commands
and fix the problem with the device.
• If more time is needed to send commands, lengthen the time
limit of the board in
IBCONF or with IBTMO .
ESTB(15)
Error Condition: Serial poll status byte(s) lost.
Solutions:
• Call IBRSP more often to read the status bytes.
• Ignore ESTB.
ESRQ(16)
Error Condition: SRQ stuck in the ON position.
Solutions:
• Ignore ESRQ until all devices are found. It occurred because
the device asserting SRQ was not opened with
IBFIND . The
automatic serial polling polls only the opened devices.
• Check that you have used IBFIND to open all devices on the
GPIB that could assert SRQ. Remove any device from the bus
if it is not being accessed.
• Using IBIC , attach one device at a time and determine that it
is unasserting SRQ after being polled.
• Inspect the interconnecting cable to see that the devices are
attached and that the connectors are seated properly.